Relief-valve.



No. 637,037. Patented Nov. I4, |899.

J, scoTT. RELIEF VALVE.

{Lpplicatinn mad. Jan. 24, 1899.5,

THE Nonms PETERS co., PHoTuLsfo.. wAsmNuToN. b. c.

v d UNITED 'STATES PATENT OFFICE.

JAMES SCOTT, OF APITTSBURGr, PENNSYLVANIA.

RELIEF-VALVE.

SPECIFICATION V:forming part of Letters Patent No. 637,037, dated November 14, 189g. Application iled January 24, 1899. Serial No. 703.266. (No model.)

To @ZZ whom t Waag concern:

Beit known that I, JAMES SCOTT, a resident of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Relief-Valves for Gas-Flues of Blast-Furnaces; and I do hereby declare the following to be a full, clear,

and exact description thereof.

My invention relates to reliefevalves for gasiiues of blast-furnaces. These relief-valves are located in the gas-ilues,which convey the waste gases from the blast-furnace to the hotblast stoves, boilers, &c., to be utilized in heating same. They must be constructed so as to yield readily when undue pressure occurs in the flues and must when seated form a tight joint with their seats or serious damage may result from explosions.

The object, therefore, of my invention is to provide a relief-valve for blast-furnace gasflues which will rise a uniform distance at all points from its seat and when returned to its seat will form a tight joint.

To these ends my invention comprises certain points of construction,which will be hereinafter set forth and claimed.

To enable others skilled in the art to make and use my invention, I will describe the same more fully, referring to the accompanying drawings, in which- Figure l is a side view of my improved relief-valve. Fig. 2 is a like view, partly in section. Fig. 3 is a section on line 3 3, Fig. 4; and Fig. 4. is a plan view.

Like letters indicate like parts in each of the figures.

The reference-letter o designates a portion of a gasiiue leading from a blast-furnace for conveying the waste gases to the hot-blast stoves, boiler, dac. Surrounding the opening b in said gas-flue o is the valve body or collar c, which is riveted or bolted to the said flue a. At the upper end of the collar c is the valveseat d, ground to form a tight joint with the ground beveled edge c of the valve e. The

upper face of the valve e has the radial ribs f, and extending up from its center is the stem g. A yoke h is bolted by means of bolts h to the flange c on the collar c. This yoke h has the central hub portion h2 with the open-- ing h3, through which the stem g passes. The upper end of the stem g has the ringz' secured therein, with which a suitable operating-lever 7c is adapted to engage.

In order to prevent `dust and dirt from col lecting in the opening 71,3, through which the stem g passes, and interfering with the free movement of said stem therein, I employ the cap m. This cap may be held in place by the ring i.

Stops n, preferably formed of wood, are secured in the brackets fn', bolted to the Iiange c. These stops regulate the height to which the valve may rise.

When my improved relief-valve is in use and the valve is seated, the ground joint be= tween said valve and its seat makes a very tight connection and the liability of leakage is reduced. If, however, the pressure in the gas-fines reaches too high a point, the Valve e will rise and allow the gas to escape. At the same time any slight explosions that may take place will lift said valve. As the valve is provided with a central stem and a guide for same as it rises, all points on its circumference are at equal distances from the valve seat, while the stops n limit the height of its movement.

'With a circular valve operated and controlled in the manner set forth said valve is not so liable to warp, so that leakage from this cause is greatly lessened.

As is well known, great quantities of dust collect in these gas-fines, and heretofore in the form of valves in use the dust collected on the valve-seats and prevented the close seating of the valve. By the use of a valve and valve-seat such as embodied in my invention no opportunity is given the dust to collect on the valve-seat in sufficient quantity to prevent the valve from seating itself tightly on its seat.

While I have described and illustrated my invention as applied to gas-hues, it is apparent that it may be applied to dust-catchers used in connection with blast-furnace plants with equal effect.

What I claim as my invention, and desire to secure by Letters Patent, is

l. In a relief-valve for blast-furnace gasiiues, a valve-body havinga circular valveseat, a valve having a beveled face adapted to engage said seat, a stein on said valve, a yoke on the Valve-body having an opening IOO therein through which said stem passes, and brackets on said valve-body with stops in the Io a cap on said stem to cover said opening, subpath of said valve, substantially as set forth.

stantially as set forth. In testimony whereof I, the said JAMES 2. In a relief-valve for blast-furnace gas- SCOTT, have hereunto set my hand.

ues, a valve-body having a circular valveseat, a valve having a beveled face adapted JAMES SCOTT' to engage said seat, a stem on said valve, a 'Vitnesses: y l

yoke on said valve-body having an opening ROBT. D. TOTTEN,

therein through which said stem passes, and GRACE C. RAYMOND. 

